 /*******************************************************************************
  * Copyright (c) 2005, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.registry;

 import org.eclipse.core.runtime.IExtension;
 import org.eclipse.core.runtime.dynamichelpers.ExtensionTracker;
 import org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.ui.internal.WorkbenchPlugin;

 /**
  * @since 3.1
  */
 public class UIExtensionTracker extends ExtensionTracker {
     private Display display;

     // SOMETHING HAS NOT BEEN DONE IN THE REGISTTRY CHANGED CODE
 // if (!PlatformUI.isWorkbenchRunning())
 // return;
 // int numDeltas = 0;
 // Display display = PlatformUI.getWorkbench().getDisplay();
 // if (display == null || display.isDisposed())
 // return;
 // It seems that the tracker should be closed.

     /**
      * @param display
      */
     public UIExtensionTracker(Display display) {
         this.display = display;
     }

     protected void applyRemove(final IExtensionChangeHandler handler, final IExtension removedExtension, final Object [] objects) {
         display.syncExec(new Runnable () {

             public void run() {
                 try {
                     handler.removeExtension(removedExtension, objects);
                 } catch (Exception e) {
                     WorkbenchPlugin.log(getClass(), "doRemove", e); //$NON-NLS-1$
 }
             }
         });
     }

     protected void applyAdd(final IExtensionChangeHandler handler, final IExtension addedExtension) {
         display.syncExec(new Runnable () {
             public void run() {
                 try {
                     handler.addExtension(UIExtensionTracker.this, addedExtension);
                 } catch (Exception e) {
                     WorkbenchPlugin.log(getClass(), "doAdd", e); //$NON-NLS-1$
 }
             }
         });
     }
 }

